I am not aware of any community where you could have these sorts of discussions. But, while I cant vouch for its quality, your question reminded me of a service I read about called Curiosity Stream. Maybe check them out.
I tried curiosity stream for a while and it was decent. I think my major complaint was that it didn’t do the technical deep dives as well. PBS space time does a great job of that. I didn’t feel like I fully understood entropy until their videos.
I have also seen ads for Magellan tv which also calls itself a streaming platform for documentaries. I know very little about it beyond the ads though.